/Engine/Source/Developer/MeshUtilities/Public/MeshUtilities.h
Calculates Normals for a given set of vertex data
void CalculateNormals ( const [TArray](API\Runtime\Core\Containers\TArray)< FVector3f > & InVertices, const [TArray](API\Runtime\Core\Containers\TArray)< uint32 > & InIndices, const [TArray](API\Runtime\Core\Containers\TArray)< FVector2f > & InUVs, const [TArray](API\Runtime\Core\Containers\TArray)< uint32 > & InSmoothingGroupIndices, const uint32 InTangentOptions, [TArray](API\Runtime\Core\Containers\TArray)< FVector3f > & OutNormals ) const